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firewall: make libiptc dependency a dlopen() one
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@ -1288,6 +1288,7 @@ conf.set10('HAVE_LIBIDN2', have)
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libiptc = dependency('libiptc',
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required : get_option('libiptc'))
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conf.set10('HAVE_LIBIPTC', libiptc.found())
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libiptc_cflags = libiptc.partial_dependency(includes: true, compile_args: true)
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libqrencode = dependency('libqrencode',
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version : '>= 3',
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@ -21,13 +21,24 @@
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#include <libiptc/libiptc.h>
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#include "alloc-util.h"
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#include "dlfcn-util.h"
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#include "firewall-util.h"
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#include "firewall-util-private.h"
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#include "in-addr-util.h"
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#include "macro.h"
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#include "socket-util.h"
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DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(struct xtc_handle*, iptc_free, NULL);
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static DLSYM_FUNCTION(iptc_check_entry);
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static DLSYM_FUNCTION(iptc_commit);
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static DLSYM_FUNCTION(iptc_delete_entry);
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static DLSYM_FUNCTION(iptc_free);
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static DLSYM_FUNCTION(iptc_init);
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static DLSYM_FUNCTION(iptc_insert_entry);
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static DLSYM_FUNCTION(iptc_strerror);
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static void *iptc_dl = NULL;
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DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(struct xtc_handle*, sym_iptc_free, NULL);
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static int entry_fill_basics(
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struct ipt_entry *entry,
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@ -86,7 +97,7 @@ int fw_iptables_add_masquerade(
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unsigned source_prefixlen) {
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static const xt_chainlabel chain = "POSTROUTING";
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_cleanup_(iptc_freep) struct xtc_handle *h = NULL;
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_cleanup_(sym_iptc_freep) struct xtc_handle *h = NULL;
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struct ipt_entry *entry, *mask;
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struct ipt_entry_target *t;
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size_t sz;
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@ -132,15 +143,15 @@ int fw_iptables_add_masquerade(
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memset(mask, 0xFF, sz);
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if (add) {
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if (iptc_check_entry(chain, entry, (unsigned char*) mask, h))
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if (sym_iptc_check_entry(chain, entry, (unsigned char*) mask, h))
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return 0;
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if (errno != ENOENT) /* if other error than not existing yet, fail */
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return -errno;
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if (!iptc_insert_entry(chain, entry, 0, h))
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if (!sym_iptc_insert_entry(chain, entry, 0, h))
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return -errno;
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} else {
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if (!iptc_delete_entry(chain, entry, (unsigned char*) mask, h)) {
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if (!sym_iptc_delete_entry(chain, entry, (unsigned char*) mask, h)) {
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if (errno == ENOENT) /* if it's already gone, all is good! */
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return 0;
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@ -148,7 +159,7 @@ int fw_iptables_add_masquerade(
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}
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}
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if (!iptc_commit(h))
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if (!sym_iptc_commit(h))
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return -errno;
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return 0;
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@ -164,7 +175,7 @@ int fw_iptables_add_local_dnat(
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const union in_addr_union *previous_remote) {
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static const xt_chainlabel chain_pre = "PREROUTING", chain_output = "OUTPUT";
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_cleanup_(iptc_freep) struct xtc_handle *h = NULL;
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_cleanup_(sym_iptc_freep) struct xtc_handle *h = NULL;
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struct ipt_entry *entry, *mask;
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struct ipt_entry_target *t;
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struct ipt_entry_match *m;
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@ -275,11 +286,11 @@ int fw_iptables_add_local_dnat(
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if (add) {
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/* Add the PREROUTING rule, if it is missing so far */
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if (!iptc_check_entry(chain_pre, entry, (unsigned char*) mask, h)) {
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if (!sym_iptc_check_entry(chain_pre, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -EINVAL;
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if (!iptc_insert_entry(chain_pre, entry, 0, h))
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if (!sym_iptc_insert_entry(chain_pre, entry, 0, h))
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return -errno;
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}
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@ -287,7 +298,7 @@ int fw_iptables_add_local_dnat(
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if (previous_remote && previous_remote->in.s_addr != remote->in.s_addr) {
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mr->range[0].min_ip = mr->range[0].max_ip = previous_remote->in.s_addr;
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if (!iptc_delete_entry(chain_pre, entry, (unsigned char*) mask, h)) {
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if (!sym_iptc_delete_entry(chain_pre, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -errno;
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}
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@ -305,11 +316,11 @@ int fw_iptables_add_local_dnat(
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entry->ip.invflags = IPT_INV_DSTIP;
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}
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if (!iptc_check_entry(chain_output, entry, (unsigned char*) mask, h)) {
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if (!sym_iptc_check_entry(chain_output, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -errno;
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if (!iptc_insert_entry(chain_output, entry, 0, h))
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if (!sym_iptc_insert_entry(chain_output, entry, 0, h))
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return -errno;
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}
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@ -317,14 +328,14 @@ int fw_iptables_add_local_dnat(
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if (previous_remote && previous_remote->in.s_addr != remote->in.s_addr) {
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mr->range[0].min_ip = mr->range[0].max_ip = previous_remote->in.s_addr;
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if (!iptc_delete_entry(chain_output, entry, (unsigned char*) mask, h)) {
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if (!sym_iptc_delete_entry(chain_output, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -errno;
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}
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}
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}
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} else {
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if (!iptc_delete_entry(chain_pre, entry, (unsigned char*) mask, h)) {
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if (!sym_iptc_delete_entry(chain_pre, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -errno;
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}
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@ -336,25 +347,43 @@ int fw_iptables_add_local_dnat(
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entry->ip.invflags = IPT_INV_DSTIP;
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}
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if (!iptc_delete_entry(chain_output, entry, (unsigned char*) mask, h)) {
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if (!sym_iptc_delete_entry(chain_output, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -errno;
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}
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}
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}
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if (!iptc_commit(h))
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if (!sym_iptc_commit(h))
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return -errno;
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return 0;
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}
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int fw_iptables_init_nat(struct xtc_handle **ret) {
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_cleanup_(iptc_freep) struct xtc_handle *h = NULL;
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static int dlopen_iptc(void) {
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return dlopen_many_sym_or_warn(
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&iptc_dl,
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"libip4tc.so.2", LOG_DEBUG,
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DLSYM_ARG(iptc_check_entry),
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DLSYM_ARG(iptc_commit),
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DLSYM_ARG(iptc_delete_entry),
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DLSYM_ARG(iptc_free),
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DLSYM_ARG(iptc_init),
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DLSYM_ARG(iptc_insert_entry),
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DLSYM_ARG(iptc_strerror));
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}
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h = iptc_init("nat");
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int fw_iptables_init_nat(struct xtc_handle **ret) {
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_cleanup_(sym_iptc_freep) struct xtc_handle *h = NULL;
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int r;
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r = dlopen_iptc();
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if (r < 0)
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return r;
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h = sym_iptc_init("nat");
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if (!h)
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return log_debug_errno(errno, "Failed to init \"nat\" table: %s", iptc_strerror(errno));
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return log_debug_errno(errno, "Failed to init \"nat\" table: %s", sym_iptc_strerror(errno));
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if (ret)
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*ret = TAKE_PTR(h);
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@ -316,7 +316,7 @@ libshared_deps = [threads,
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libcrypt,
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libdl,
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libgcrypt,
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libiptc,
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libiptc_cflags,
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libkmod,
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liblz4,
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libmount,
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